This product has been created due to a question which zone3 often hear lsquowhat goes under my tri suitrsquo the answer is simply lsquonothing goes under your tri suitrsquo the tri suit is designed for no underwear to be worn underneath however for the majority of budding triathletes this answer isnrsquot always enough they resort to wearing pants swimming trunks or boxers underneath their suit which can create a lot of chafing and discomfort